Komatsu WA480-8, Operation & Maintenance Manual

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NOTICE
• Komatsu genuine fuel filter cartridges use a special filter that has highly efficient filtering ability.
When replacing parts, Komatsu recommends using Komatsu genuine parts.
• The common rail fuel injection system used on this machine consists of more precise parts than
those in the conventional injection pump and nozzles. If any cartridge other than a Komatsu genu-
ine filter cartridge is used, dust or dirt may get in and cause problems with the injection system.
Never use a substitute.
• When performing inspection and maintenance of the fuel system, be careful not to let any dirt or
dust get in, more than ever before. If dust sticks to the fuel system, wash it off thoroughly with fuel.
Items to be prepared
• Container to catch drained oil
• Filter wrench
When replacing the fuel main filter cartridge (every 1000 hours), replace the fuel prefilter cartridge first.
1.
Open the engine side cover on the right side of the ma-
chine.
2.
Place a container under the fuel prefilter cartridge to catch
the fuel.
3.
Loosen drain valve (1) and drain water and sediments
from transparent cup (2), and also drain all the fuel from fil-
ter cartridge (3).
4.
Remove drain hose.
5.
Turn filter cartridge (3) counterclockwise by using the filter
wrench, and remove it.
6.
Make sure that drain valve (1), which is provided in the lower part of transparent cup (2) of the new filter
cartridge, is firmly tightened.
Tightening torque: 2.5 to 3.4 Nm {0.25 to 0.35 kgm}
7.
Clean the filter holder and apply thin film of oil to the pack-
ing surface.
Remove filter cartridge cap (A) and install to the filter hold-
er.
8.
Clean the filter head, fill the new filter cartridge with clean fuel, thinly apply oil to the packing surface, then
install it to the filter head.
NOTICE
• When filling the filter cartridge with fuel, do not re-
move cap (A) at the center. Always fill with fuel
from small holes (B) (8 places) on the dirty side.
• After filling with fuel, remove cap (A) and install
the fuel filter.
• Always fill with clean fuel. Be careful not to let any
dirt or dust get into the fuel. In particular, center
portion is the clean side, so do not remove cap (A)
when filling with fuel. Be careful not to let dirt or
dust get into the center portion on the clean side.
MAINTENANCE PROCEDURE MAINTENANCE
4-50